Democritus ("chosen of the people") was an Ancient Greek philosopher born in Abdera, Thrace, Greece. He was an influential pre-Socratic philosopher who formulated an atomic theory for the cosmos. His exact contributions are difficult to dis...

Diagoras "the Atheist" of Melos was a Greek poet and sophist of the 5th century BC. Throughout antiquity, he was regarded as an atheist, but very little is known for certain about what he actually believed. Anecdotes about his life indicate...

Plato was a philosopher in Classical Greece and the founder of the Academy in Athens, the first institution of higher learning in the Western world. He is widely considered the most pivotal figure in the development of philosophy, especiall...

Epicurus was an ancient Greek philosopher as well as the founder of the school of philosophy called Epicureanism. Only a few fragments and letters of Epicurus's 300 written works remain. Much of what is known about Epicurean philosophy deri...

Titus Lucretius Carus was a Roman poet and philosopher. His only known work is the epic philosophical poem on Epicureanism De rerum natura, translated into English as On the Nature of Things or "On the Nature of the Universe". According to...

Leonardo da Vinci was an Italian Renaissance polymath: painter, sculptor, architect, musician, mathematician, engineer, inventor, anatomist, geologist, cartographer, botanist, and writer. His genius, perhaps more than that of any other figu...

Niccolò di Bernardo dei Machiavelli was an Italian historian, politician, diplomat, philosopher, humanist, and writer based in Florence during the Renaissance. He was for many years an official in the Florentine Republic, with responsibilit...

Paul-Henri Thiry, Baron d'Holbach was a French-German author, philosopher, encyclopedist and a prominent figure in the French Enlightenment. He was born Paul Heinrich Dietrich in Edesheim, near Landau in the Rhenish Palatinate, but lived an...

Arthur Schopenhauer was a German philosopher. He is best known for his 1818 work The World as Will and Representation (expanded in 1844), wherein he characterizes the phenomenal world as the product of a blind and insatiable metaphysical wi...

Karl Heinrich Marx was a German philosopher, economist, sociologist, historian, journalist, and revolutionary socialist. Marx's work in economics laid the basis for the current understanding of labour and its relation to capital, and has in...

Friedrich Engels was a German social scientist, author, political theorist, philosopher, and father of Marxist theory, alongside Karl Marx.
In 1845 he published The Condition of the Working Class in England, based on personal observatio...

Friedrich Wilhelm Nietzsche was a German philologist, philosopher, cultural critic, poet and composer. He wrote several critical texts on religion, morality, contemporary culture, philosophy and science, displaying a fondness for metaphor,...

Sigmund Freud was an Austrian neurologist who became known as the founding father of psychoanalysis.
In creating psychoanalysis, a clinical method for treating psychopathology through dialogue between a patient and a psychoanalyst, Freud...

Bertrand Arthur William Russell, 3rd Earl Russell was a British philosopher, logician, mathematician, historian, writer, social critic, political activist, and Nobel laureate. At various points in his life, Russell considered himself a libe...

Jean-Paul Charles Aymard Sartre was a French philosopher, playwright, novelist, screenwriter, political activist, biographer, and literary critic. He was one of the key figures in the philosophy of existentialism and phenomenology, and one...